Theoretical mechanics

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Verification work on theoretical mechanics

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1 For stepwise iron rod (Fig . ) From the condition strength cross-sectional area , if [ σr ] = 60 MPa [ σs ] = 100 MPa. The data needed to solve the problem of its options , choose Table .
2 solid section Steel Shaft decided to replace the equal in strength to the shaft section of the ring with the diameter ratio c = d0 / d = 0,7. Determine the size and weight compared shaft continuous and circular cross-sections , if they are designed to transmit power P = 30 kW at an angular velocity of rotation w = 30 rad / s and the maximum voltage must not exceed [τ] = 30 MPa .
3 Given a doubly-supported beams (fig. ) To determine the support reactions , build diagrams transverse forces and bending moments and selected on the basis of strength of circular cross -sectional dimensions , having [σ] = 150MPa . Scheme beams to solve their problems vari¬anta choose Table . 2 .
4 The drive consists of a power elektrodvi¬gatelya RDV with ndv speed shaft and the two-stage transmission comprising a gearbox and an open transmission characteristics of which units (d or z) are given . Required: a) the overall efficiency of the drive and the gear ratio ; b) The power angular soon -sti and torques for all shafts . Furthermore, it should give a description of the drive and its individual programs ( Figure 34 , Table 3) .
5 Run the geometrical calculation of the transmission gear . Transmission type ( worm ) and its gear ratio u take from the previous one ( 31 ... 40 ) of the problem , and the spacing AW - from the table .
6 To pick up the gear shaft bearings . Load Irreversible, quiet . The operating temperature of the bearing assembly must not exceed 65º. Bearing life Lh = 12 • 103 ( Table 5 , Figure 3 )


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